package com.seaengine.util
{
	import com.seaengine.net.Buffer;
	
	public class NetUtils
	{
		private static var crc32table:Array = [
			0x00000000,	0x77073096,	0xee0e612c,	0x990951ba,
			0x076dc419,	0x706af48f,	0xe963a535,	0x9e6495a3,
			0x0edb8832,	0x79dcb8a4,	0xe0d5e91e,	0x97d2d988,
			0x09b64c2b,	0x7eb17cbd,	0xe7b82d07,	0x90bf1d91,
			0x1db71064,	0x6ab020f2,	0xf3b97148,	0x84be41de,
			0x1adad47d,	0x6ddde4eb,	0xf4d4b551,	0x83d385c7,
			0x136c9856,	0x646ba8c0,	0xfd62f97a,	0x8a65c9ec,
			0x14015c4f,	0x63066cd9,	0xfa0f3d63,	0x8d080df5,
			0x3b6e20c8,	0x4c69105e,	0xd56041e4,	0xa2677172,
			0x3c03e4d1,	0x4b04d447,	0xd20d85fd,	0xa50ab56b,
			0x35b5a8fa,	0x42b2986c,	0xdbbbc9d6,	0xacbcf940,
			0x32d86ce3,	0x45df5c75,	0xdcd60dcf,	0xabd13d59,
			0x26d930ac,	0x51de003a,	0xc8d75180,	0xbfd06116,
			0x21b4f4b5,	0x56b3c423,	0xcfba9599,	0xb8bda50f,
			0x2802b89e,	0x5f058808,	0xc60cd9b2,	0xb10be924,
			0x2f6f7c87,	0x58684c11,	0xc1611dab,	0xb6662d3d,
			0x76dc4190,	0x01db7106,	0x98d220bc,	0xefd5102a,
			0x71b18589,	0x06b6b51f,	0x9fbfe4a5,	0xe8b8d433,
			0x7807c9a2,	0x0f00f934,	0x9609a88e,	0xe10e9818,
			0x7f6a0dbb,	0x086d3d2d,	0x91646c97,	0xe6635c01,
			0x6b6b51f4,	0x1c6c6162,	0x856530d8,	0xf262004e,
			0x6c0695ed,	0x1b01a57b,	0x8208f4c1,	0xf50fc457,
			0x65b0d9c6,	0x12b7e950,	0x8bbeb8ea,	0xfcb9887c,
			0x62dd1ddf,	0x15da2d49,	0x8cd37cf3,	0xfbd44c65,
			0x4db26158,	0x3ab551ce,	0xa3bc0074,	0xd4bb30e2,
			0x4adfa541,	0x3dd895d7,	0xa4d1c46d,	0xd3d6f4fb,
			0x4369e96a,	0x346ed9fc,	0xad678846,	0xda60b8d0,
			0x44042d73,	0x33031de5,	0xaa0a4c5f,	0xdd0d7cc9,
			0x5005713c,	0x270241aa,	0xbe0b1010,	0xc90c2086,
			0x5768b525,	0x206f85b3,	0xb966d409,	0xce61e49f,
			0x5edef90e,	0x29d9c998,	0xb0d09822,	0xc7d7a8b4,
			0x59b33d17,	0x2eb40d81,	0xb7bd5c3b,	0xc0ba6cad,
			0xedb88320,	0x9abfb3b6,	0x03b6e20c,	0x74b1d29a,
			0xead54739,	0x9dd277af,	0x04db2615,	0x73dc1683,
			0xe3630b12,	0x94643b84,	0x0d6d6a3e,	0x7a6a5aa8,
			0xe40ecf0b,	0x9309ff9d,	0x0a00ae27,	0x7d079eb1,
			0xf00f9344,	0x8708a3d2,	0x1e01f268,	0x6906c2fe,
			0xf762575d,	0x806567cb,	0x196c3671,	0x6e6b06e7,
			0xfed41b76,	0x89d32be0,	0x10da7a5a,	0x67dd4acc,
			0xf9b9df6f,	0x8ebeeff9,	0x17b7be43,	0x60b08ed5,
			0xd6d6a3e8,	0xa1d1937e,	0x38d8c2c4,	0x4fdff252,
			0xd1bb67f1,	0xa6bc5767,	0x3fb506dd,	0x48b2364b,
			0xd80d2bda,	0xaf0a1b4c,	0x36034af6,	0x41047a60,
			0xdf60efc3,	0xa867df55,	0x316e8eef,	0x4669be79,
			0xcb61b38c,	0xbc66831a,	0x256fd2a0,	0x5268e236,
			0xcc0c7795,	0xbb0b4703,	0x220216b9,	0x5505262f,
			0xc5ba3bbe,	0xb2bd0b28,	0x2bb45a92,	0x5cb36a04,
			0xc2d7ffa7,	0xb5d0cf31,	0x2cd99e8b,	0x5bdeae1d,
			0x9b64c2b0,	0xec63f226,	0x756aa39c,	0x026d930a,
			0x9c0906a9,	0xeb0e363f,	0x72076785,	0x05005713,
			0x95bf4a82,	0xe2b87a14,	0x7bb12bae,	0x0cb61b38,
			0x92d28e9b,	0xe5d5be0d,	0x7cdcefb7,	0x0bdbdf21,
			0x86d3d2d4,	0xf1d4e242,	0x68ddb3f8,	0x1fda836e,
			0x81be16cd,	0xf6b9265b,	0x6fb077e1,	0x18b74777,
			0x88085ae6,	0xff0f6a70,	0x66063bca,	0x11010b5c,
			0x8f659eff,	0xf862ae69,	0x616bffd3,	0x166ccf45,
			0xa00ae278,	0xd70dd2ee,	0x4e048354,	0x3903b3c2,
			0xa7672661,	0xd06016f7,	0x4969474d,	0x3e6e77db,
			0xaed16a4a,	0xd9d65adc,	0x40df0b66,	0x37d83bf0,
			0xa9bcae53,	0xdebb9ec5,	0x47b2cf7f,	0x30b5ffe9,
			0xbdbdf21c,	0xcabac28a,	0x53b39330,	0x24b4a3a6,
			0xbad03605,	0xcdd70693,	0x54de5729,	0x23d967bf,
			0xb3667a2e,	0xc4614ab8,	0x5d681b02,	0x2a6f2b94,
			0xb40bbe37,	0xc30c8ea1,	0x5a05df1b,	0x2d02ef8d
	];
	
		public function NetUtils()
		{
		}
		
		public static function computeCRC32( _body:Buffer, len:uint):uint
		{
			
			var crcret:uint = 0xffffffff;
		
			for ( var i:uint = 0 ; i<len; i++ )
			{				
				crcret = (crcret>>>8) ^ crc32table[(crcret & 0x0ff) ^ uint(_body[i])];
			}
			return crcret ^ 0xffffffff;

		
		}
		
	}
}